Question

A magnifying glass is used, as the object to be viewed can be brought closer to the eye than the normal near point. This results in

• A. the formation of a virtual erect image.
• B. infinite magnification at the near point.
• C. a larger angle to be subtended by the object at the eye and hence viewed in greater detail.
• D. increase in the field of view.

Answer 1

Answer: (A), (C)

a larger angle to be subtended by the object at the eye and hence viewed in greater detail.

Step 1:Draw a labelled diagram.

Step 2:Find magnification and nature of image.

For magnification, when final image is formed at 𝐷 and $\infty$ $(i,e,m_{D}and{m}_{\infty })$ ,

$m_D={(1+\frac{D}{f})}_{max}$

and $m_{\infty }={\left(\frac{D}{f}\right)}_{min}$




When a magnifying glass is used of lesser focal length, as a result larger angle is subtended by the object at the eye and hence, viewed in greater detail. Moreover, the formation of a virtual, erect and enlarged image takes place.

Final Answer: (a), (b)